Detecção de resíduos de soluções sanitizantes empregadas em pedilúvio para bovinos no leite e solo
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Data
2011-07-04
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Universidade Federal de Goiás
Resumo
Copper sulfate and sodium hypochlorite are used in the preparation of cattle
footbath solutions, aimed at treating and preventing digital diseases, but little is
known about the residues that these substances leave in animal products. The
purpose of this study was to evaluate, on soil and milk, residues left by chemicals
used in cattle foot bath. The study was developed in two stages. In the first stage,
the residual of chlorine and copper in the milk of healthy cows after successive
passages in footbath solutions containing these substances was analyzed and the
costs of the solutions were estimated. The presence of copper residues was
evaluated using atomic absorption spectrophotometry and chlorine residues were
evaluated by dosing total chloride in milk using a commercial kit. In the
experiment, 14 healthy cows were divided into two groups (GI and GII) of seven
animals each. In GI a solution of sodium hypochlorite 1% was used and in GII
copper sulphate 5% was used. The milk samples were collected before the
passage through the footbath (M0) after 24 (M1), 48 (M2) and 72 hours (M3) and
15 days (M15), following the last passage. Statistical analysis comparing the
moments of each sample and the substances evaluated was performed using
Friedman test followed by Dunn's test (p <0.05). It was concluded that the values
of total chloride and copper in the milk of healthy cattle, after daily passage in
footbath for a period of seven days, showed some variations considered
insufficient to cause harm to human health and the solutions did not show
exorbitant costs. In the second stage, copper residues were evaluated in soil
treated with a mixture of cattle feces and urine, simulating cattle liquid manure,
containing or not copper sulfate solution. Initially samples were collected from soil
in pastures of EVZ / UFG, which were placed in PVC columns divided into four
layers. The columns were divided into three treatments (CI, CII and CIII). The CI
treatment received only cattle liquid manure and the CII and CIII treatments
received the same material added of different amounts of copper sulfate solution.
During 120 days, rain was simulated on the PVC columns. In the statistical
analysis, analysis of variance followed by the Scott-Knott test at 5% probability
were used. It was observed that copper levels were significantly higher in CIII
treatment than in CI and CII. The same is true regarding the treatments CII for CI.
In treatments CII and CIII copper levels were significantly higher in the superficial
layer of soil throughout the experimental period. It was concluded that copper
residues available to plants in soil treated with a mixture containing bovine feces
and urine associated with copper sulfate solution and water are higher in the upper
layers of the soil showing no significant changes in the deeper layers after
consecutive rains.
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GOULART, Daniel Silva. Residues detection of sanization solution used in foot bath for bovines in milk and soil. 2011. 81 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2011.